Carbureter



c. E. RAIYFIELD.

CARBURETER.

APPLICATION FILED SEPT. 15. 1916.

Patented Mar. 30, 1920.

2 SHEETS-SHEET I C." L. RAYFIELD.

CARBURETER.

APPLICATION FILED SEPT-15. 1913.

Patented Mar. 30

r zyxfsmr 2.

/ mn v I UNITED STATES PATENT oFFicE. 1

CHARLES L. RAYFIELD, OF CHICAGOQ ILLINOIS, ASSIG-NOR TO FINDEISEN & KROPF MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLI- I NOIS.

GARBURETER.

Patented Ma1n30,"1920.

.Application filed September 15, 1916. Serial No. 120,383.

To all whom it mag concern:

Be it known that I, ,CHARLES L. -RAY FIELD, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Carbureters; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part ofthis specification.

This invention relates to an improvement in that type of c-arbureter such as shown in my co-pending application for patent filed of even date herewith, Serial .No. 120,381, and wherein a piston is operated by an automatic air valve of the carbureter in a dash pot to steady the movement of the air valve and also force fuel under pressure to an auxiliary fuel nozzle provided in the carbureter.

This invention further relates to an im .provement in c-arbureter construction in the manner of operation and construction of the auxiliary fuel nozzle controlled by .a metering pin'wherein the nozzle is connected to receive fuel from a dash pot chamber Wherein a piston of an improved form 1s dISPOSGd and connected for operation by the stem of an automatic air valve of the carbureter and acting 'further to permit the air valve to positively actuate the metering pin without necessitating the air valve working against the additional stress of the metering pin spring which normally holds the same closed in said nozzle.

It is an object therefore of this invention to construct a carbureter wherein an improved type of check valve piston is op' erated' in a dash pot by an automatic air valve with an improved auxiliary fuel nozzle and metering pin controlling the same which is adapted to be positively operated by the air valve without affecting the operation of the air valve.

It is also an object of this invention to construct a carbureter wherein a piston operates in a dash pot to force fuel under ressure to an auxiliary fuel nozzle operated:

which serves to positively actuate the metering pin controllin the fuel nozzle into open position and at t e same time moves the automatically by an air valve in the carbureter spring to permit unopposed opening movement of said tapered meterin pin.

It is also an object of this invention to construct a carbureter utilizing, an automatic air valve positively connected to a check valve piston operating in a dash pot to steady the movement of the air valve and acting further to force fuel under pressure to an auxiliary fuel nozzle controlled by a tapered metering pin which is positively aotuatable by the air valve in its opening movement.

, It is furthermore an object of this invenan auxiliary jetof fuel to the air entering.

the carbureter.

It is finally an object of this invention to construct an improvement in carbureter construction whereby greater sensitiveness of operation is obtained with less resistance to the admission of air through the carbureter and wherein an economy in consumption of fuel and greater flexibility of operation particularly for acceleration purposes,' is obtained. p

Tl e invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

In the drawings: 1

Figure 1 is an elevati'onof one side of a carbureter embodying the principles of my invention.

Fig. 2 is anelevation of the other side thereof. a I

Fig. 3 isaqcentral vertical detail section taken through one endof the carbureter with'parts" shownin elevation. V I

Fig. 4. 1s a Agimilar view showing the parts in another p ition of adjustment.

Fig. 5 is an enlarged detail section with parts in elevatibn, of the auxiliary nozzle and its metering pin. 1

Fig. 6 is a bottom plan view of the in verted piston used in the dash pot chamber of the oarbureter.

Fig. is a fragmentary detail section taken-on line 7-7 of Fig.5. r r

Fig. 8 is an enlarged fragmentary detail illustrating the play between the piston and disk. 1

As shown in the drawings: Referring to Figs. 1 and 2, the reference numeral 1, indicates a float chamber of the carbureter, which is formed integral with a mixing chamber 2, thereof which has an air inlet 26 and connected on one side of the mixing chamber 2, is a casing 3, having an air inlet passage 4, through the interior thereof, as shown in detail in Figs. 3 and 4,

and a dash pot chamber 5, formed on the lower end thereof closed by a large closure plug 6. A pipe connection 7, leads from the'fioat chamber 1, to the cored extension at one side of the dash pot chamber 5, having a passage 8, therein, which leads upvalve 11, takes place, the piston 15-16, 1s

wardly and communicates into the upper end of the dash pot chamber. Formed integral with a partition in the casing 3, form ing the top wall of the dash pot chamber 5,

is a long upwardly extending tubular extension 9, and slidably mounted therewithin is a stem 10, on the upper end of which is secured a conical air inlet valve 11, adapted to close against an annular seat member 12, which is threaded into the upper end of said casing 3, so as to be adjustable into different positions therein, and is held in an adjusted position by a set screw 13. As clearly shown, the under surface of the conical air valve 11, is recessed in order to permit the same to move downwardly over the upper end of the tubular extension 9, and seated within said recess of said valve is a coiled compression spring 14, which is also wound about said tubular extension 9, and seated at its lower end at the base thereof. Secured upon the lower end'of the stem 10, is a fiat disk 15, and slidably mounted therebcneath is an apertured piston 16, the extent of movement, however, between the same and said fixed disk 15, on said stem, being very small. Thus when the piston is thrust downwardly in the dash pot, the member' 16, bears closely beneath the disk 15, sealing the apertures in the member 16.

Secured in the top wall of the dash pot chamber 5, and projecting upwardly to a point just below the air valve 11, in the air inlet passage 4, is an auxiliary fuel nozzle 17, and slidable in the lower end thereof is a sleeve 18, which rests on the top surface of the piston disk 15, over an aperture therethrough which is in register with one of the aper Lures in the movable piston member 16 and said disk 15, and piston 16, are held from relative rotation by pin 16 which is secured on the piston 16 and engages a notch in the edge of the disk 15. Disposed within said sleeve member 18, is a coiled spring 19,'and seated loosely thereon is the lower tubular end 20, of a tapered metering pin 21, which extends upwardly through the nozzle 17, and in its tubular portion 20, is provided with a plurality of apertures or orifices 22. Fromisaid tubular portion the me ering pin is provided with a passage 25, which extends above sleeve 17, when the metering in is at its upper limit of movement and ms an aperture 24 at the upper e-ndwhich supplies fuel to the engine for idling speed. Cored within one wall of the casing member 3, as clearl shown in Figs. 3 and 4, is a longupwardiy directed passage or stand pipe 23, communicatingin the upper'end of the dash'pot chamber 5, and leading upwardly-and at its upper end opening laterally into the threaded connection between 1 the annular seat member 12, and said casing.

The operation is as follows: When an opening movement of the air ,through the sleeve member 18, of the auxiliary fuel nozzle, passing through the orifices 22, of the metering pin, and upwardly around the metering pin through the annular orifice afforded through the open nozzle 17, due to the fact that the tapered metering pin 21, has moved or has been moved downwardly into open position simultaneously with downward movement of the air valve 11, and the piston in the dash pot. The spring 19, which holds the metering pin normally closed does not resist operation of the air valve, for the reason that the spring 19, moves downwardly with the sleeve 18,

which is rigidly secured to the piston, at the same time that the engagement of the air valve with the upper end of the metering pin moves the metering pin to the open position. The fuel, of course, is forced upwardly around the metering pin when it'is moved downwardly through the nozzle and sprayed into the air passage4, to carburet the incoming air admitted past the air valve.

When the suction draft through the carbulightly or not thereagainst as desired, due

to its spring l4,and, of course, this possible adjustment of the relative position of the air valve in the casing, determines the time interval after the initial opening of the valve before the metering pin 21, may be contacted to be depressed into open position.

The threaded connection of the valve seat member 12 with the casing 3 does not make a tight joint and provides a restricted vent for the passage 23 in the wall of the casing 3, which serves as a compensating air passage or chamber so that the cylinder will always be full of liquid and no air will be trapped in the upper part of the cylinder.

I am aware that various details of construction may be varied through a wide ran e without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention:

1. In a carbureter having a mixing chamber, a dash pot chamber with an outlet to the mixing chamber and a fuel supply chamber communicating with the dash pot chamber, the combination of an air valve for the mixing chamber, a piston in the dash pot chamber operated by the air valve, a metering pin for regulating said outlet, resilient means adapted to exert a pressure to hold the metering pin in the normal position, and means for simultaneously moving the metering pin to enlarge the outlet and operating the piston to pump fuel from the dash pot through the outlet into the mixing chamber as the air valve is opened and at the same time releasing the resilient means so as to prevent opposition by the resilient means to the opening movement of the air valve.

2. In a carbureter of the class described the combination of'a fuel supply chamber, an air inlet means including an automatic air valve, a piston connected therewith, a dash pot chamber in which said piston moves, said dash pot chamber communicating with said fuel supply chamber, a fuel nozzle communicating with the pressure end of said dash pot chamber and with the air inlet means, a sleeve telesco ically connected with said nozzle and mova le with the piston, a tapered metering pin in the nozzle adapted to be contacted by said air valve to be positively depressed to open the nozzle to permit admission of fuelinto the air inlet means, and a spring engaging the metering pin and movable bodily with the sleeve.

3. In a carbureter of the class described, the combination with a fuel supply chamber and air inlet means, of an automatically operating air 'valve forming a part of said means, a dash pot chamber in communication with said fuel supply chamber, a piston comprising adisk, a stem rigidly connecting said disk with said air valve, a piston element apertured and slidably mounted beneath said disk so as to form a check valve construction within said dash pot chamber, and means affording communication between said nozzle and one side of said piston in said dash pot whereby downward move ment of the air valve serves to move said piston to pump fuel under pressure through said fuel nozzle.

4. In a carburetor the combination of a fuel nozzle, a regulating valve therefor, a

fuel pump for supplying fuel to the fuel nozzle, a suction operated air valve for simultaneously opening the fuel valve and operating the pump to supply fuel through the fuel nozzle, and resilient means for yieldingly closing the fuel valve adapted to be moved with'the air valve to permit opening movement of the fuel valve without opposition by the resilient means to the operation of the air valve.

5-. In a carbureter for explosive engines, a casing having an air passageway therethrough and means for admitting liquid fuel thereto for normal running, a dashpot having a plunger, a fuel valve, a resilient connection movable with and arranged between said valve and plunger and normally holding the valve in closed position, and a draft-- controlled valve for moving the fuel valve to open position.

In testimony whereof I have hereunto subscribed myname in the presence of two subscribing witnesses.

CHARLES L. RAYFIELD.

Witnesses:

CHARLES W. HILLs, JR., EARL M. HARDINE. 

